Datasheet

OUTPUT
VOLTAGE
DIGITAL INPUT CODE
0
0 4095
ZE
FSE
GE = FSE - ZE
FSE = GE + ZE
4095 x V
A
4096
DAC128S085
www.ti.com SNAS407F –AUGUST 2007–REVISED MARCH 2013
MOST SIGNIFICANT BIT (MSB) is the bit that has the largest value or weight of all bits in a word. Its value is
1/2 of V
A
.
MULTIPLYING BANDWIDTH is the frequency at which the output amplitude falls 3dB below the input sine wave
on V
REF1,2
with the DAC code at full-scale.
NOISE SPECTRAL DENSITY is the internally generated random noise. It is measured by loading the DAC to
mid-scale and measuring the noise at the output.
POWER EFFICIENCY is the ratio of the output current to the total supply current. The output current comes from
the power supply. The difference between the supply and output currents is the power consumed by the device
without a load.
SETTLING TIME is the time for the output to settle to within 1/2 LSB of the final value after the input code is
updated.
TOTAL HARMONIC DISTORTION PLUS NOISE (THD+N) is the ratio of the harmonics plus the noise present at
the output of the DACs to the rms level of an ideal sine wave applied to V
REF1,2
with the DAC code at mid-scale.
WAKE-UP TIME is the time for the output to exit power-down mode. This is the time from the rising edge of
SYNC to when the output voltage deviates from the power-down voltage of 0V.
ZERO CODE ERROR is the output error, or voltage, present at the DAC output after a code of 000h has been
entered.
TRANSFER CHARACTERISTIC
Figure 2. Input / Output Transfer Characteristic
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